Remove redundant 'msft' compilation error rule (bug#39595)

When the 'msft' rule was moved and modified, the old copy was left
in place by mistake.

* lisp/progmodes/compile.el (compilation-error-regexp-alist-alist):
Remove old rule.

lisp/progmodes/compile.el

@@ -391,13 +391,6 @@ of[ \t]+\"?\\([a-zA-Z]?:?[^\":\n]+\\)\"?:" 3 2 nil (1))
     (mips-2
      " in \\([^()\n ]+\\)(\\([0-9]+\\))$" 1 2)
 
-    (msft
-     ;; The message may be a "warning", "error", or "fatal error" with
-     ;; an error code, or "see declaration of" without an error code.
-     "^ *\\([0-9]+>\\)?\\(\\(?:[a-zA-Z]:\\)?[^:(\t\n]+\\)(\\([0-9]+\\)) \
-: \\(?:see declaration\\|\\(?:warnin\\(g\\)\\|[a-z ]+\\) C[0-9]+:\\)"
-     2 3 nil (4))
-
     (omake
      ;; "omake -P" reports "file foo changed"
      ;; (useful if you do "cvs up" and want to see what has changed)